cgm73
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Does anyone know the components needed and procedure to use liquid oxygen with a blend stick. Thanks for the help
Convert Blend stick to use liquid oxygen.
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cgm73
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Price is not the reason. Portability is. Nitrox in remote areas hard to get. If we own a compressor but have to transport 2 125cuft oxygen tanks across the ocean and can’t get them filled over there. “Liquid oxygen takes up much less space in a canister than oxygen in a gaseous state does, making liquid oxygen containers lighter and smaller than oxygen gas cylinders. For reference, one liter of liquid oxygen is equal to about 860 liters of gaseous oxygen” local dive shop has a setup I might go see if they will let me look at there setup. thanks
LOX Dewars normally deliver "boiled off" gas at a low pressure. Check with your gas supplier to see what flow rate they can handle without a heat exchanger. You should be able to feed that gas into the mixing stick normally.
That is an interesting idea-I'm looking forward to reading post from members. @captain has experience with lox to gox equipment.
I would be more inclined to use oxygen concentrators to supply the O2. @tbone1004 can probably point you in the right direction for such a setup.
I would be more inclined to use oxygen concentrators to supply the O2. @tbone1004 can probably point you in the right direction for such a setup.
The big problem with cryogenic gas is Dewars have a normal minimum boil-off rate, which is wasted if you can't use it for long periods. LOX has the additional problem of not being able to safely store it indoors due to fire risks.
We used large Dewars for liquid Nitrogen offshore for high purity Helium recovery on DSVs in the 1970s and 80s.
:-( Sorry I've done a terrible job at articulating my thought. What I mean is to use a membrane system ( Nitrox Generating Systems Overview | Nuvair) or oxygen concentrators (like medical oxygen concentrators) that remove N2 from the air instead of lox to gox.
Yeah, I hear you about the waste. A few military aircraft I worked on used lox. Boil off from the bottle and from the storage tanks always seemed unfortunate.
Yeah, I hear you about the waste. A few military aircraft I worked on used lox. Boil off from the bottle and from the storage tanks always seemed unfortunate.
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So for a large scale commercial shop the LOX bottles are way better from a cost perspective and those will all have some sort of outlet for a low pressure regulator that you can connect the oxygen lines to. I don't know about the small portable cylinders but any sort of regulator for them will let them act just like a gas cylinder. You don't need the HP side, only a continuous flow regulator so that's quite easy to sort out.
Membranes are way too expensive to buy and maintain to be considered viable options when you can purchase O2 readily.
I'm not sure where you are planning to go, but as said above the oxygen boils off fairly rapidly if they are in warm weather, so it would not be my recommended approach.
The special forces travel with portable oxygen concentrators and small compressors that they use to fill O2 for their oxygen rebreathers. You can't practically make one big enough to direct feed a compressor of any respectable size, but if you have the compressor it's just a waste of electricity. If you look up my workbench thread you'll see where I took a normal portable home oxygen concentrator with the fill station on top of it from Invacare and use it to fill my O2 tanks.
Oops! I wasn't debating your point, only using it as background to further explain why your suggestion is valid.
Cryogenic is a great option for high volume consumers that only need low pressure — hospitals, steel fabrication shops, and ship yards for example. I have never seen where LOX pencils out for remote locations offshore.
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cgm73
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boil off will be negligible we can fill 20-25 tanks at a time. The dewers canister is what I was looking at. Would you just pipe it straight to blend stick from dewers canister are would you need a heat exchanger between dewers and blend stick? Thanks
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